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N-compounds speciation analysis in environmental samples using ultrasound-assisted solid–liquid extraction and non-chromatographic techniques

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Abstract

A fast, efficient, and non-chromatographic method was presented in this study for nitrite, nitrate, and p-nitrophenol (N-compounds) extraction and speciation analysis of environmental samples. By applying ultrasound-assisted solid–liquid extraction (USLE), analytes were efficiently extracted from water, soil, or sediment collected in areas of environmental disaster. These analytes were selectively converted to NO(g) through UV photolysis (NO3), H2O2/UV photocatalysis (PNP), and direct conversion (NO2). Following conversion, NO(g) was separated from the liquid phase and determined by high-resolution continuum source molecular absorption spectrometry (HR-CS MAS). The LODs obtained were 0.097 ± 0.004 mg L−1 for nitrite, 0.119 ± 0.004 mg L−1 for nitrate, and 0.090 ± 0.006 mg L−1 for p-nitrophenol. On applying this speciation method to environmental samples, concentrations were found to be up to 0.99 ± 0.03 mg L−1 (NO2), 49.80 ± 2.5 mg L−1 (NO3), and 0.10 ± 0.02 mg L−1 (PNP). Finally, addition/recovery study of real water, soil, and sediment samples showed 101 ± 2% recovery for NO2, 100 ± 1% for NO3, and 96 ± 5% for PNP.

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All data generated or analyzed during this study are included in this published article. The original (raw) experimental data can be requested from the corresponding author by email upon justification.

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Funding

This work was financially supported by Fundação de Amparo à Pesquisa do Estado de Minas Gerais (Fapemig), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, grant # 88887.368533/2019–00 and Code # 001; 88881.068088/2014–01 and Code # 001), Fundação de Amparo à Pesquisa do Estado de São Paulo (grants: 2013/07296–2, 2014/50249–8, 2017/11986–5), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and Shell. J. A.

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All authors contributed to the study conception and design. Ailton José Moreira: writing and Methodology; Carolina Dakuzaku Freschi and Ernesto C. Pereira: writing-review and editing; Gian Paulo Giovanni Freschi: writing, conceptualization, supervision. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Ailton José Moreira.

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The authors declare no competing interests.

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Highlights

1. Application of a non-chromatographic method for speciation of N-compounds.

2. Fast and efficient extraction of N-compounds in environmental samples of soil and sediments.

3. Effective elimination of matrix interferents during the analytical process.

4. Accessible speciation method for the purpose of environmental monitoring of N-compounds.

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Moreira, A.J., Freschi, C.D., Pereira, E.C. et al. N-compounds speciation analysis in environmental samples using ultrasound-assisted solid–liquid extraction and non-chromatographic techniques. Environ Monit Assess 193, 297 (2021). https://doi.org/10.1007/s10661-021-09088-w

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  • DOI: https://doi.org/10.1007/s10661-021-09088-w

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